Quarterly report pursuant to Section 13 or 15(d)

AVAILABLE-FOR-SALE AND OTHER SECURITIES AVAILABLE-FOR-SALE AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details)

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AVAILABLE-FOR-SALE AND OTHER SECURITIES AVAILABLE-FOR-SALE AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value    
Less than 12 Months $ 9,788,317 $ 10,687,088
Over 12 Months 1,404,316 494,614
Total 11,192,633 11,181,702
Unrealized Losses    
Less than 12 Months (151,481) (221,568)
Over 12 Months (51,536) (40,076)
Total (203,017) (261,644)
Federal agencies: Mortgage-backed securities    
Fair Value    
Less than 12 Months 8,283,266 8,908,470
Over 12 Months 1,003,097 41,706
Total 9,286,363 8,950,176
Unrealized Losses    
Less than 12 Months (125,950) (189,318)
Over 12 Months (26,209) (1,349)
Total (152,159) (190,667)
Federal agencies, Other agencies    
Fair Value    
Less than 12 Months 11,607 924
Over 12 Months 0 0
Total 11,607 924
Unrealized Losses    
Less than 12 Months (56) (6)
Over 12 Months 0 0
Total (56) (6)
Total U.S. Treasury, Federal agency securities    
Fair Value    
Less than 12 Months 8,294,873 8,909,394
Over 12 Months 1,003,097 41,706
Total 9,297,970 8,951,100
Unrealized Losses    
Less than 12 Months (126,006) (189,324)
Over 12 Months (26,209) (1,349)
Total (152,215) (190,673)
Municipal securities    
Fair Value    
Less than 12 Months 1,293,344 1,412,152
Over 12 Months 277,157 272,292
Total 1,570,501 1,684,444
Unrealized Losses    
Less than 12 Months (23,995) (29,175)
Over 12 Months (10,768) (9,627)
Total (34,763) (38,802)
Asset-backed securities    
Fair Value    
Less than 12 Months 199,109 361,185
Over 12 Months 122,568 178,924
Total 321,677 540,109
Unrealized Losses    
Less than 12 Months (1,471) (3,043)
Over 12 Months (14,553) (29,092)
Total (16,024) (32,135)
Corporate debt    
Fair Value    
Less than 12 Months 200 3,567
Over 12 Months 0 200
Total 200 3,767
Unrealized Losses    
Less than 12 Months (1) (15)
Over 12 Months 0 0
Total (1) (15)
Other securities    
Fair Value    
Less than 12 Months 791 790
Over 12 Months 1,494 1,492
Total 2,285 2,282
Unrealized Losses    
Less than 12 Months (8) (11)
Over 12 Months (6) (8)
Total $ (14) $ (19)